题目内容：
大量失血时，首先发生的反应是
A．脑和心脏的血管收缩 B．循环血液中儿茶酚胺减少
C．外周阻力降低
D．外周阻力增加
E．肾脏排出Na+增多
参考答案：
答案解析：
单选题：大量失血时，首先发生的反应是
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B．循环血液中儿茶酚胺减少
C．外周阻力降低
D．外周阻力增加
E．肾脏排出Na+增多
B．循环血液中儿茶酚胺减少
C．外周阻力降低
D．外周阻力增加
E．肾脏排出Na+增多
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